【单选题】【消耗次数：1】
如果已在银幕上呈清晰的投影图像，但图像较小，应将投影器
①
前移
②
后移
③
上移
④
下移
参考答案：
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银幕上投影的图像画面出现 上窄下宽的几何失真，这是由于( )造成的。
①
张挂的银幕没有向前倾斜
②
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标高投影图是（ ）。
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用平行投影的正投影法绘制的多面投影图
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